(19)
(11) EP 0 469 876 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
19.08.1992 Bulletin 1992/34

(43) Date of publication A2:
05.02.1992 Bulletin 1992/06

(21) Application number: 91307001.7

(22) Date of filing: 30.07.1991
(51) International Patent Classification (IPC)5: G03G 15/09, G03G 13/09
(84) Designated Contracting States:
DE FR GB IT

(30) Priority: 31.07.1990 JP 203234/90
31.07.1990 JP 203235/90

(71) Applicant: MITA INDUSTRIAL CO., LTD.
Osaka 540 (JP)

(72) Inventors:
  • Fuji, Kazuo
    Higashi-osaka-shi, Osaka-fu (JP)
  • Yabe, Naruo
    Tarumi-ku, Kobe-shi (JP)
  • Nakakuma, Akira
    Takaishi-shi, Osaka-fu (JP)
  • Watanabe, Akihiro
    Kita-katsuragi-gun, Nara-ken (JP)
  • Kuramae, Yoshihisa
    Hirakata-shi, Osaka-fu (JP)
  • Tsubota, Noriaki
    Yashiro, Himeji-shi (JP)
  • Kubo, Masahiko
    Yao-shi, Osaka-fu (JP)
  • Edahiro, Kazuhisa
    Higashi-kouri, Hirakata-shi, Osaka-fu (JP)
  • Nishino, Toshio
    Nara-shi (JP)

(74) Representative: Senior, Alan Murray et al
J.A. KEMP & CO., 14 South Square, Gray's Inn
London WC1R 5LX
London WC1R 5LX (GB)


(56) References cited: : 
   
       


    (54) Magnetic brush development process


    (57) The present invention provides a magnetic brush developing method using a two-component developer, characterized in that the development is carried out under such conditions that at the position where the sliding contact of the magnetic brush with the surface of the photosensitive material drum terminates, the following requirement is satisfied:



    wherein Px represents the magnetic force (Gauss) acting in the tangential direction on the surface of the developing sleeve, and Py represents the magnetic force (Gauss) acting in the normal line direction on the surface of the developing sleeve. This avoids carrier dragging.






    Search report